Budget Calculator
Build a monthly budget and see where your money goes using the 50/30/20 framework.
The Formula
Needs = Income × 0.50
Wants = Income × 0.30
Savings = Income × 0.20
Needs (50%) = $2,500 — rent, groceries, utilities
Wants (30%) = $1,500 — dining, entertainment
Savings (20%) = $1,000
The 50/30/20 Rule Explained
The 50/30/20 rule is one of the simplest and most widely used budgeting frameworks. After-tax income gets divided into three buckets: 50% toward needs (housing, groceries, utilities, minimum debt payments, basic transportation), 30% toward wants (dining out, entertainment, hobbies, streaming services, travel), and 20% toward savings and debt payoff above minimums. It was popularized by Senator Elizabeth Warren and works well as a starting framework — though your specific percentages may need adjusting based on where you live and your income level.
Why Budgeting Works Even When It Is Imperfect
The primary value of a budget is not perfection — it is awareness. Research consistently shows that people who track their spending save significantly more than those who do not, even when the tracking is rough and inconsistent. Discovering that you spent $580 on dining last month when you thought you spent $200 is actionable information. A budget that you actually look at once a month — even a simple one — beats a perfect budgeting system you abandoned after two weeks.
Zero-Based Budgeting: Going a Step Further
Zero-based budgeting assigns every dollar of income to a specific category until income minus all allocations equals zero. Every dollar has a job. This approach takes more discipline than the 50/30/20 method but gives you much more granular control and tends to surface spending leaks more effectively. Apps like YNAB (You Need A Budget) are built around this philosophy and have strong reputations for helping people pay down debt and build savings faster.
Frequently Asked Questions
What counts as a need vs. a want?
Needs are expenses required to maintain basic housing, food, and transportation: rent or mortgage, groceries, utilities, minimum debt payments, health insurance, and basic transportation to work. Wants are discretionary: restaurants, streaming services, gym memberships, vacations, and clothing beyond basics. The line can blur — a car might be a need in a city with no public transit, or a want in a city with excellent transit.
Is the 50/30/20 rule realistic in expensive cities?
In cities like New York, San Francisco, or Boston, housing alone can easily consume 40–50% of after-tax income, making the 50/30/20 split very difficult. In these situations, adjust the percentages to fit your reality while maintaining the underlying principle: spend intentionally, save something every month, and avoid lifestyle inflation. Even 60/25/15 with a conscious plan beats no plan.
How do I budget with irregular income?
Budget from your lowest expected monthly income as the baseline. In higher-income months, direct the extra toward savings or debt payoff according to a predefined priority order. Freelancers and self-employed people benefit from keeping a larger cash buffer in checking, and from automatically setting aside 25–30% of every payment for taxes before spending anything.
What are the best budgeting apps?
YNAB (You Need A Budget) is widely considered the gold standard for serious budgeters — it uses zero-based budgeting and has strong educational resources, though it charges a subscription fee. Monarch Money and Copilot offer automatic expense tracking with clean interfaces. EveryDollar is a free zero-based app. For simplicity, a Google Sheet you actually check regularly works fine.
How do I budget for irregular expenses like car repairs?
Use sinking funds — dedicated savings categories for predictable but irregular expenses. Estimate annual costs for car maintenance, home repairs, medical, and gifts, divide by 12, and set that amount aside monthly in a separate account. When the expense arrives, the money is already there. Common monthly sinking fund targets: car maintenance $100–200, home repairs $150–300 for homeowners, gifts and holidays $50–150.